CN102073130A - Zoom lens - Google Patents
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- CN102073130A CN102073130A CN 201110048044 CN201110048044A CN102073130A CN 102073130 A CN102073130 A CN 102073130A CN 201110048044 CN201110048044 CN 201110048044 CN 201110048044 A CN201110048044 A CN 201110048044A CN 102073130 A CN102073130 A CN 102073130A
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Abstract
The invention provides a high-power zoom lens system, which adopts an internal focusing mode, does not cause overall length change due to focusing, and has high optical performance even in the process of shooting an object in a short distance, a small size, light weight and high imaging performance. The provided zoom lens system focuses by moving two light lens groups, does not bring heavy load to an automatic focusing mechanism, can automatically focus at a high speed, and is facilitated in the aspects of the size of the overall diameter of a lens cone, power consumption and impact force resistance. The zoom lens system is characterized by comprising a first lens group (G1) with positive focal power, a second lens group (G2) with negative focal power, a third lens group (G3) with negative focal power, a subsequent lens group and an aperture in sequence from an object side, wherein the third lens group (G3) and at least one lens group which is closer to an image side than the third lens group (G3) are moved forward and backward on an optical axis so as to focus.
Description
Technical field
The present invention relates to employed zoom lens (zoom lens) in 35mm camera, video camera, the electronic stills camera (stillcamera) etc., more specifically, relate to and to be installed on the zoom lens of short so-called single-lens reflector-free camera (Mirrorless interchangeable-lens camera) of back focal length.
Background technology
In the past, in the zoom lens that single-lens reflex camera is used, between this zoom lens and photo detector, had rotating mirror, so the back focal length that must extend has limited the degree of freedom that zoom lens designs.Single-lens reflector-free camera then has the back focal length that can shorten zoom lens, the advantage that increases the degree of freedom of zoom lens design.
As zoom lens in the past, proposition has a kind of zoom lens (with reference to patent documentation 1), this zoom lens has one or more following lens combination: comprise the 1st lens combination G1 with positive light coke successively from object side, have the 2nd lens combination G2 of negative power and be positioned at its 3rd lens combination G3 as side, by the airspace between above-mentioned the 1st lens combination G1 and above-mentioned the 2nd lens combination G2 is changed and zoom, it is characterized in that, above-mentioned the 2nd lens combination G2 from object side successively by concave surface towards the picture side negative lens composition L1, concave surface is towards the negative lens composition L2 of object side, positive lens composition L3, negative lens composition L4 and positive lens composition L5 constitute, when closely object point is focused from the infinity direction, by being moved to the object direction, above-mentioned the 2nd lens combination G2 focuses, or make above-mentioned the 3rd lens combination G3 move and focus to the image planes direction, or by combination these both, above-mentioned the 2nd lens combination G2 is moved to the object direction, make above-mentioned the 3rd lens combination G3 move and focus simultaneously, satisfy following conditional (1) and conditional (2) to the image planes direction.
(1)0＜n4-n5＜0.4
(2)0.06＜Φ5/|ΦII|＜0.5
Wherein,
N4: the negative lens among the above-mentioned negative lens composition L4 is to the refractive index of d line
N5: the positive lens among the above-mentioned positive lens composition L5 is to the refractive index of d line
Φ II: the focal power of above-mentioned the 2nd lens combination G2 integral body
Φ 5: the focal power of the positive lens composition L5 among above-mentioned the 2nd lens combination G2
As another zoom lens in the past, proposition has following zoom lens (with reference to patent documentation 2), this zoom lens from object side to comprising successively as side: the 1st lens combination of positive light coke, the 2nd lens combination of negative power, and the rear lens group that comprises 1 above lens combination, carry out zoom by the interval variation that makes each lens combination, it is characterized in that, has aperture, when with the 2nd lens combination as the 1st focus group, and the sub-lens group that will constitute the part in the middle of 1 lens combination in this rear lens group is during as the 2nd focus group, the 1st focus group and the 2nd focus group all have positive lens and negative lens, to constitute the average Abbe number of material of the positive lens of the 1st focus group and negative lens respectively as Vmp, Vmn, to constitute the average Abbe number of material of the positive lens of the 2nd focus group and negative lens respectively as Vsp, Vsn, will be when infinity accommodates to minimum photographic distance, the difference of the distance of the vertex of surface of close object side from this aperture to the 1st focus group is as Δ Xm, will be when infinity accommodates to minimum photographic distance, the difference of the distance of the vertex of surface of close object side from this aperture to the 2nd focus group meets the following conditions during as Δ Xs.
ΔXm×(Vmn-Vmp)×ΔXs×(Vsn-Vsp)＞0
As a zoom lens more in the past, proposition has following zoom lens (with reference to patent documentation 3), it is characterized in that, this zoom lens has a plurality of lens combination and aperture, carry out zoom at interval by changing above-mentioned a plurality of lens combination respectively from the wide-angle side state to the telescope end state, comprising successively from the most close object side: the 1st lens combination of positive light coke, the 2nd lens combination of negative power, and the 3rd lens combination, and from the wide-angle side state when the telescope end state zoom, the interval of above-mentioned the 1st lens combination and above-mentioned the 2nd lens combination increases, the interval of above-mentioned the 2nd lens combination and above-mentioned the 3rd lens combination reduces, above-mentioned the 2nd lens combination and than above-mentioned the 2nd lens combination by being focusing lens group as at least 1 lens combination of side, according to focal length state from the wide-angle side state to the telescope end state, at least 1 central lens combination of above-mentioned focusing lens group is moved, focus to closer object from remote object, satisfy following condition.
0.2＜(Xnw-X2w)/Xnw 0.5＜(X2t-Xnt)/X2t
Wherein, X2w: the amount of movement of above-mentioned the 2nd lens combination during closely the focusing of wide-angle side state, Xnw: the amount of movement of the n lens combination except above-mentioned the 2nd lens combination during closely the focusing of wide-angle side state, X2t: the amount of movement of above-mentioned the 2nd lens combination during closely the focusing of telescope end state, Xnt: the amount of movement of the n lens combination except above-mentioned the 2nd lens combination during closely the focusing of telescope end state.
Patent documentation 1: No. the 4096399th, Jap.P.
Patent documentation 2: TOHKEMY 2009-198552 number
Patent documentation 3: TOHKEMY 2007-093974 number
In patent documentation 1 disclosed large-aperture zoom lens, focus by the 2nd lens combination and the moving of the lens combination except the 2nd lens combination of this negative power of negative power.Positive lens groups is that the 1st lens combination is that the lens number ground that the positive bigger zoom lens of multiplying power can't be avoided having more than 3 constitutes the 2nd lens combination in advance, has weight to become heavy tendency.
As the embodiment 1 of patent documentation 1, make the formation number that is configured in the aperture rear be 4 the 3rd lens combination move be formed in focusing the time the 2nd lens combination of Heavy Weight is moved.Therefore, autofocus mechanism is brought big burden, also have the problem that solve aspect the size of the lens barrel under the situation of carrying out at a high speed AF, consumption electric power and the impact resistance, so bad.
As the embodiment 2 of patent documentation 1, the 2nd lens combination of Heavy Weight is moved, autofocus mechanism is brought big burden, and Focusing mechanism maximizes, also there is the problem that solve in the same manner with the embodiment 1 of patent documentation 1.
In patent documentation 2 disclosed zoom lens, aberration during focusing changes, particularly the change of ratio chromatism, is few, yet, there is the complicated and such problem that maximizes of autofocus mechanism to carrying out moving of different the 1st focus group Lm that move and the 2nd focus group Ls independently of each other.
In patent documentation 3 disclosed zoom lens, the lens combination that the time moves about focusing, aperture does not move but is fixing in the 1st embodiment, but many 1st lens combination, the 2nd lens combination and the 3rd lens combination of heavy caliber and number move respectively independently.In the focusing of the 2nd embodiment was moved, except the 1st lens combination～the 4th lens combination, aperture slot moved.Aperture is fixed in the 3rd embodiment, and still the 1st lens combination, the 2nd lens combination, the 3rd lens combination, the 5th lens combination move respectively independently.Above-mentioned any embodiment is the structure that heavier lens combination intricately is moved, and has the complicated and such problem that maximizes of autofocus mechanism.
Summary of the invention
The present invention makes in view of the above problem of in the past zoom lens, its purpose is to provide burnt (inner focus) mode in a kind of employing, can not change because of focusing brings total length, even when closer object is taken, also can obtain the good optical performance, the high magnification Zoom lens system that small-sized light weight and imaging performance are good.
The present invention also aims to provide a kind of moving to focus by the lens combination of 2 and weigh light only, autofocus mechanism is not brought big burden, can carry out automatic focusing at a high speed, also favourable Zoom lens system aspect size, consumption electric power and the impact resistance of lens barrel.
The present invention is a kind of Zoom lens system, it is characterized in that, comprises successively from object side:
The 1st lens combination G1 with positive light coke;
The 2nd lens combination G2 with negative power;
The 3rd lens combination G3 with negative power;
And follow-up lens combination,
This Zoom lens system has aperture,
By making above-mentioned the 3rd lens combination G3 and focusing near moving before and after at least 1 lens combination of image planes side is on optical axis than above-mentioned the 3rd lens combination G3.
Zoom lens system utilization of the present invention formation as described above, burnt mode in adopting, has following effect, promptly, even can not constitute and can when closer object is taken, can obtain the good optical performance, the high magnification Zoom lens system that small-sized light weight and imaging performance are good yet because of focusing brings total length to change.
Adopt Zoom lens system of the present invention, focus by the moving of lens combination that only makes 2 and weigh light, has following effect, promptly, can not constitute autofocus mechanism is brought big burden, can carry out automatic focusing at a high speed, also favourable Zoom lens system aspect size, consumption electric power and the impact resistance of lens barrel.
Particularly above-mentioned the 3rd lens combination is with other lens combination, particularly compare with the 2nd lens combination, and lens diameter can miniaturization, is suitable for assembling Focusing mechanism.
Technical scheme of the present invention and characteristic thereof below are described.
(1) the 1st technical scheme is a Zoom lens system of the present invention, it is characterized in that, satisfies following condition.
(1)0.6＜F2/F3＜1.4
F2: the focal length of the 2nd lens combination
F3: the focal length of the 3rd lens combination
The conditional of the 1st technical scheme (1) is used to stipulate the ratio of the focal length of above-mentioned the 2nd lens combination G2 that bears and negative above-mentioned the 3rd lens combination G3.
If be lower than lower limit, the focal length of above-mentioned the 2nd lens combination G2 shortens, or the focal length of above-mentioned the 3rd lens combination G3 is elongated, then the focal power of the 2nd lens combination G2 becomes excessive, and particularly the curvature of the image variation of wide-angle side is difficult to proofread and correct, and the amount of movement of the 3rd lens combination G3 during focusing increases.And, be difficult to proofread and correct from the coma aberration of object distance infinity to minimum distance.
If be higher than the upper limit, the focal length of above-mentioned the 2nd lens combination G2 is elongated, or the focal length of above-mentioned the 3rd lens combination G3 shortens, and then from aberration change, particularly the coma aberration variation of telescope end of object distance infinity to minimum distance, is difficult to proofread and correct.
Making conditional (1) is 0.7＜F2/F3＜1.3 o'clock, can obtain the more balanced effect of lens barrel size, eccentric sensitivity.
Making conditional (1) further is 0.8＜F2/F3＜1.2 o'clock, can obtain the further suitably balanced effect of lens barrel size, eccentric sensitivity.
(2) the 2nd technical schemes are according to Zoom lens system of the present invention, it is characterized in that, satisfy following condition.
(2)0.18＜F1/FT＜2.10
F1: the focal length of the 1st lens combination
FT: the focal length of telescope end
Conditional (2) is used for the focal length of above-mentioned the 1st lens combination G1 of regulation telescope end.
If be higher than the upper limit, the focal length of above-mentioned the 1st lens combination G1 is elongated, and then the optical full length of telescope end increases, and the overhang from the wide-angle side to the telescope end increases the problem that generation lens barrel total length enlarges.
If be lower than lower limit, the focal length of above-mentioned the 1st lens combination G1 shortens, and then is difficult to proofread and correct aberration on the axle of the excessive g line of telescope end generation.
Make conditional (2) be 0.20＜| F1/FT|＜2.05 o'clock can obtain the more balanced effect of aberration on lens barrel size, the axle.
Make conditional (2) be 0.21＜| F1/FT|＜2.00 o'clock can obtain the further suitably balanced effect of aberration on lens barrel size, the axle.
(3) the 3rd technical schemes are according to Zoom lens system of the present invention, it is characterized in that, satisfy following condition.
(3)0.05＜β3＜0.20
The imaging multiplying power of the telescope end of 3: the 3 lens combination of β
Conditional (3) is used to stipulate the imaging multiplying power of the telescope end of the 3rd lens combination G3.
If be lower than lower limit, multiplying power diminishes, and then the amount of movement the during focusing of the 3rd lens combination G3 increases, the entrance pupil position deepens, that is, and and near the imaging side, front lens i.e. the enlarged-diameter of the object side lens of the 1st lens combination G1, exists optical full length to be compelled to elongated such problem.
If be higher than the upper limit, it is big that multiplying power becomes, the amount of movement of the 3rd lens combination G3 in the time of can't guaranteeing to focus that then becomes, and curvature of the image is excessive, is difficult to proofread and correct.
If to make conditional (3) is 0.06＜β 3＜0.18, then can obtain following effect, that is, and can guarantee the dwindling of lens barrel size, near the time image planes flatness.
If to make conditional (3) further is 0.065＜β 3＜0.155, then can further obtain following effect, that is, can guarantee dwindling of lens barrel size, near the time image planes flatness.
(4) the 4th technical schemes are according to Zoom lens system of the present invention, it is characterized in that, the 3rd lens combination G3 is made of single lens composition.
By making the 3rd lens combination G3 is single lens composition, can seek the lightweight of focus group, becomes to be suitable for the formation of the high speed motion of focusing automatically.Here, so-called single lens composition is meant the term that comprises single grinding lens, non-spherical lens, compound non-spherical lens, engages lens.In the middle of not comprising, single lens composition has positive and negative 2 lens of air layer ground configuration etc.
(5) the 5th technical schemes are according to Zoom lens system of the present invention, it is characterized in that, above-mentioned follow-up lens combination has the 4th lens combination at least, and the 4th lens combination G4 is made of single lens composition.
The 5th technical scheme is, is single lens composition by making the 4th lens combination G4, can seek the lightweight of focusing lens group, becomes to be suitable for the formation of the high speed motion of focusing automatically.
(6) the 6th technical schemes are according to Zoom lens system of the present invention, it is characterized in that, above-mentioned follow-up lens combination has the 4th lens combination at least, when zoom, from the wide-angle side to the telescope end, the 1st lens combination G1 and the 2nd lens combination G2 move in the mode that it enlarges at interval, and the 3rd lens combination G3 and the 4th lens combination G4 move in the mode that it dwindles at interval.
The Zoom lens system of the 6th technical scheme can obtain following effect by constituting in this wise, that is, on one side can guarantee sufficient zoom ratio, Yi Bian the image planes position is kept constant.
The Zoom lens system of the 6th technical scheme can also further improve the zoom ratio from above-mentioned the 1st lens combination G1 to above-mentioned the 2nd lens combination G2, so can seek the densification of lens barrel size.
In the Zoom lens system of the 6th technical scheme, above-mentioned the 1st lens combination G1, the 2nd lens combination G2 move with respect to pinch image planes when zoom, implement the present invention but also can fix the 1st lens combination G1 ground.
Because above-mentioned the 3rd lens combination G3 has negative power, so so that above-mentioned the 3rd lens combination G3 is focused to the mode that object side stretches out.
(7) the 7th technical schemes are according to the Zoom lens system of the 6th technical scheme, it is characterized in that,
The lens combination that constitutes the part of above-mentioned follow-up lens combination has the VC lens combination that moves along the direction vertical with optical axis when vibrationproof, this VC lens combination has negative power (Power) as a whole, and constitute by positive and negative 2 lens at least, satisfy following condition.
(4)-1.0＜FVC/FM＜-0.1
FVC: the focal length of included vibration-proof lens group in the follow-up lens combination
FM: the focal length of follow-up lens combination
In the Zoom lens system of the 7th technical scheme, the vibration-proof lens group has negative power.If the paraxial horizontal multiplying power with the vibrationproof lens combination is β 1, the paraxial horizontal multiplying power of the lens combination that it is later is β 2, and then the correction amount of movement of required vibration-proof lens group is directly proportional with ambiguity correction coefficient (ambiguity correction coefficient=(1-β 1) * β 2) when vibrationproof.
Paraxial horizontal multiplying power β 1 is negative value to the lens combination with negative power, so compare with the situation of the lens combination with positive light coke, the absolute value of ambiguity correction coefficient is easy to increase, and can carry out vibrationproof with little amount of movement.
In the Zoom lens system of the 7th technical scheme, when the glass material of vibration-proof lens group was selected, the axle when preventing vibrationproof was gone up the aberration variation, preferably is made of positive and negative at least 2 lens, and the Abbe difference of positive lens and negative lens is about about 7.
Conditional (4) is used to stipulate the ratio of the focal length of the focal length of above-mentioned VC group and above-mentioned follow-up lens combination.
When vibrationproof, with the direction of light shaft positive cross on make under the situation that above-mentioned VC group moves, if be higher than the upper limit of conditional (4), then proofreading and correct amount of movement increases, and causes vibration proof mechanism to maximize, so undesirable.
If be lower than the lower limit of conditional (4), the vibrationproof sensitivity of then above-mentioned VC group improves, and is difficult to guarantee the claimed accuracy of position control when carrying out ambiguity correction.
If making conditional (4) is-0.54＜FVC/FM＜-0.12, then can make mechanism's densification of vibration-proof lens group, the imaging performance when improving vibrationproof more.
If making conditional (4) is-0.33＜FVC/FM＜-0.21 further, then can make mechanism's densification of vibration-proof lens group, the imaging performance when further improving vibrationproof.
(8) the 8th technical schemes are according to Zoom lens system of the present invention, it is characterized in that, above-mentioned follow-up lens combination has the 4th lens combination at least, and said aperture S is configured between above-mentioned the 3rd lens combination G3 and above-mentioned the 4th lens combination G4.
In the Zoom lens system of the 8th technical scheme, the camera lens of the zoom type that the 3rd lens combination G3 from the 2nd lens combination G2 of the 1st lens combination G1 of object side positive light coke, negative power, negative power arranges, preferred aperture position configuration is than the position of above-mentioned the 3rd lens combination G3 by the image planes side.By with the entrance pupil position configuration near the central authorities of optical system, can obtain following effect, that is, can guarantee to make the configuration space of the driver of negative the 3rd lens combination G3 action.
(9) the 9th technical schemes are according to Zoom lens system of the present invention, it is characterized in that, said aperture S when zoom and the part of above-mentioned follow-up lens combination or whole one move.
If with aperture S as independently one move group and constitute lens barrel, the cam path that then is exclusively used in cam ring is necessary, produce for fear of the cam path with other and interfere, and generation has to increase the such problem of lens barrel diameter.
Description of drawings
Fig. 1 is the optical picture of zoom lens of the infinity focusing state of the 1st embodiment of the present invention, comprises that also the zoom of each lens combination moves figure.
Fig. 2 is spherical aberration, astigmatism, the aberration diagram of distortion aberration of zoom wide-angle side of the zoom lens of the 1st embodiment of the present invention.
Fig. 3 is spherical aberration, astigmatism, the aberration diagram of distortion aberration of zoom middle focal length of the zoom lens of the 1st embodiment of the present invention.
Fig. 4 is spherical aberration, astigmatism, the aberration diagram of distortion aberration of zoom telescope end of the zoom lens of the 1st embodiment of the present invention.
Fig. 5 be do not carry out the 1st embodiment of the present invention zoom lens the zoom telescope end image blur correcting basic status and carried out the lateral aberration diagram of the state of image blur correcting.
Fig. 6 is the optical picture of zoom lens of the infinity focusing state of the 2nd embodiment of the present invention, comprises that also the zoom of each lens combination moves figure.
Fig. 7 is spherical aberration, astigmatism, the aberration diagram of distortion aberration of zoom wide-angle side of the zoom lens of the 2nd embodiment of the present invention.
Fig. 8 is spherical aberration, astigmatism, the aberration diagram of distortion aberration of zoom middle focal length of the zoom lens of the 2nd embodiment of the present invention.
Fig. 9 is spherical aberration, astigmatism, the aberration diagram of distortion aberration of zoom telescope end of the zoom lens of the 2nd embodiment of the present invention.
Figure 10 be do not carry out the 2nd embodiment of the present invention zoom lens the zoom telescope end image blur correcting basic status and carried out the lateral aberration diagram of the state of image blur correcting.
Embodiment
Following with reference to the description of drawings embodiments of the present invention.In each embodiment, the unit of the length of numerical tabular is " mm ", the unit at visual angle be " ° ".In addition, R is a radius-of-curvature, and D is an interplanar distance, and Nd is the refractive index with respect to the d line, and Vd is the Abbe number with respect to the d line.In addition, the face of mark ASP is an aspheric surface.Aspherical shape is defined by following formula.
z＝ch
2/[1+{1-(1+k)c
2h
2}
1/2]+A4h
4+A6h
6+A8h
8+A10h
10...
C: curvature (1/r)
H: apart from the height of optical axis
K: circular cone coefficient
A4, A6, A8, A10...: the asphericity coefficient of each number of times
In the aberration diagram of each embodiment, represent successively: spherical aberration (mm), astigmatism (mm), distortion aberration (%) from the left side.In spherical aberration diagram, the longitudinal axis is represented F value (F-number) (representing with Fno among the figure), and solid line is the characteristic of d line, and dotted line is the characteristic of g line.In astigmatism figure, the longitudinal axis is represented visual angle (representing with ω among the figure), and solid line is the sagittal image surface characteristic of (representing with s among the figure), and dotted line is the meridianal image surface characteristic of (representing with m among the figure).In the distortion aberration diagram, the longitudinal axis is represented visual angle (representing with ω among the figure).
In each lateral aberration diagram, the state representation of image blur correcting of not carrying out telescope end is in centre, makes the vibration-proof lens group move the image blurring state representation of telescope end of scheduled volume along the direction with the optical axis approximate vertical in upside, downside.
The epimere of each lateral aberration diagram is corresponding to the lateral aberration of 70% picture point of maximum image height, and hypomere is corresponding to the lateral aberration of-70% picture point of maximum image height.
The transverse axis of each lateral aberration diagram is illustrated in the distance apart from chief ray on the pupil plane, and solid line is the characteristic of d line, and dotted line is the characteristic of g line.
(the 1st embodiment)
As shown in Figure 1, the zoom lens of the 1st embodiment of the present invention by the 1st lens combination G1 that is arranged in order from object side, the 2nd lens combination G2 with negative power with positive light coke, have negative power the 3rd lens combination G3, aperture S, have the 4th lens combination G4 of positive light coke, the 5th lens combination G5 that has a positive light coke as a whole constitutes
Above-mentioned the 1st lens combination is made of towards the positive meniscus shaped lens of object side doublet, the convex surface of negative lens that is arranged in order from object side and positive lens,
Above-mentioned the 2nd lens combination G2 has aspheric surface by the face at object side that is arranged in order from object side and constitutes at negative meniscus lens, negative lens, biconvex lens that object side has a convex surface,
Above-mentioned the 3rd lens combination G3 constitutes by having convex surface in the image planes side and having aspheric negative lens,
Above-mentioned the 4th lens combination G4 is made of 1 positive lens with two sides,
Above-mentioned the 5th lens combination G5 is made of 5A group, 5B group and 5C group,
This 5A group is made of the doublet of doublet, negative lens and the positive lens of positive lens that is arranged in order from object side and negative lens,
This 5B group is made of the doublet of positive lens that is arranged in order from object side and negative lens,
This 5C group is by two convex lens that are arranged in order from object side, have the negative lens of convex surface and constitute at the positive lens that object side has a convex surface in the image planes side.
When zoom, all lens combination move.Interval between the 1st lens combination G1 and the 2nd lens combination G2 enlarges from the wide-angle side to the telescope end, interval between the 2nd lens combination G2 and the 3rd lens combination G3 enlarges from the wide-angle side to the telescope end, interval between the 4th lens combination G4 and the 5th lens combination G5 enlarges from the wide-angle side to the telescope end, and the interval between the 5th lens combination G5 and the shooting face enlarges from the wide-angle side to the telescope end.
When focusing, the 3rd lens combination G3 moves to object side, and the 4th lens combination G4 is to a pinch image planes side shifting.The 5B group is along moving with optical axis approximate vertical direction during vibrationproof.
In the 1st embodiment, disposing parallel flat by shooting face side.This is to consider panel (face plate) on the imaging apparatus face, be disposed at color filter between lens combination and the imaging apparatus etc. and they are used as the glass suitable with it.
The optical data of the zoom lens of the 1st embodiment is as follows.
Face R D Nd Vd
0 ∞
1 278.867 1.500 1.90366 31.3
2 66.841 7.998 1.49700 81.6
3 -182.755 0.200
4 58.606 6.561 1.74330 49.2
5 308.839 is variable
6ASP 59.665 0.200 1.51460 50.0
7 53.596 1.200 1.83400 37.3
8 11.866 4.670
9 -29.126 0.800 1.80420 46.5
10 84.097 0.200
11 34.639 3.148 1.92286 20.9
12-35.311 is variable
13 -15.272 1.000 1.80420 46.5
14ASP-40.983 is variable
15 aperture ∞ are variable
16ASP 28.773 2.600 1.69680 55.5
17ASP-88.127 is variable
18 18.310 5.357 1.49700 81.6
19 -19.373 1.283 1.80610 33.3
20 -40.189 0.205
21 18.464 1.000 1.90366 31.3
22 8.903 3.400 1.48749 70.4
23 34.848 1.000
24ASP 38.629 3.505 1.68893 31.1
25 -11.471 0.800 1.83481 42.7
26 16.857 1.600
27 37.997 8.219 1.60342 38.0
28 -23.977 3.085
29 -14.455 1.000 1.90366 31.3
30 -121.076 0.200
31 61.344 3.899 1.64769 33.8
32-32.309 is variable
33 ∞ 2.000 1.51680 64.2
34 ∞
Aspherical surface data
The 6th K=0.00000E+00A4=1.21677E-05A6=3.43318E-08A8=-2.28338E-10 A10=8.42022E-13
The 14th K=0.00000E+00A4=-1.31376E-05A6=1.00153E-08A8=-3.15578E-1 0A10=6.70510E-13
The 16th K=-1.94393E+01A4=9.39281E-05A6=-6.71448E-07A8=3.63502E-0 9A10=-1.49265E-12
The 17th K=0.00000E+00A4=1.27206E-05A6=1.28201E-07A8=-2.32578E-09 A10=1.92635E-11
The 24th K=0.00000E+00A4=4.65271E-05A6=-5.51169E-08A8=7.91858E-09 A10=-2.33567E-11
VC looks in the distance in the middle of the wide-angle
Focal length 1 8.48 60.00 200.00 200.00
F value 3.50 5.80 6.30 6.32
Visual angle 39.18 13.14 3.96 4.48
d5 0.800 23.295 59.500 59.500
d12 3.435 3.023 3.023 3.023
d14 16.520 4.795 1.200 1.200
d15 4.407 5.228 1.900 1.900
d17 3.711 2.889 6.219 6.219
d32 12.500 42.938 46.531 46.531
Lens total length 109.007 149.803 186.006 186.006
(the 2nd embodiment)
As shown in Figure 6, the zoom lens of embodiments of the present invention 2 by the 1st lens combination G1 that is arranged in order from object side, the 2nd lens combination G2 with negative power with positive light coke, have negative power the 3rd lens combination G3, aperture S, have the 4th lens combination G4 of positive light coke, the 5th lens combination G5 that has a positive light coke as a whole constitutes
Above-mentioned the 1st lens combination G1 is made of towards the positive meniscus shaped lens of object side doublet, the convex surface of negative lens that is arranged in order from object side and positive lens,
Above-mentioned the 2nd lens combination G2 has aspheric surface by the face at object side that is arranged in order from object side and constitutes at negative meniscus lens, negative lens, biconvex lens that object side has a convex surface,
Above-mentioned the 3rd lens combination G3 constitutes by having convex surface in the image planes side and having aspheric negative lens,
Above-mentioned the 4th lens combination G4 is made of 1 positive lens with two sides,
Above-mentioned the 5th lens combination G5 is made of 5A group, 5B group and 5C group,
This 5A group is made of the doublet of positive lens that is arranged in order from object side and negative lens,
This 5B group is made of the doublet of positive lens that is arranged in order from object side and negative lens,
This 5C group is by two convex lens that are arranged in order from object side, have the negative lens of convex surface and constitute at the positive lens that object side has a convex surface in the image planes side.
When zoom, all lens combination move.Interval between the 1st lens combination G1 and the 2nd lens combination G2 enlarges from the wide-angle side to the telescope end, interval between the 2nd lens combination G2 and the 3rd lens combination G3 enlarges from the wide-angle side to the telescope end, interval between the 4th lens combination G4 and the 5th lens combination G5 enlarges from the wide-angle side to the telescope end, and the interval between the 5th lens combination G5 and the shooting face enlarges from the wide-angle side to the telescope end.
From object distance infinitely when minimum distance is focused, the 3rd lens combination G3 moves to object side, the 4th lens combination G4 is to a pinch image planes side shifting.The 5B group is along moving with optical axis approximate vertical direction during vibrationproof.
In the 2nd embodiment, disposing parallel flat by shooting face side.This is to consider panel on the imaging apparatus face, be disposed at color filter between lens combination and the imaging apparatus etc. and they are used as the glass suitable with it.
The optical data of the zoom lens of the 2nd embodiment is as follows.
The face data
Face R D Nd Vd
0 ∞
1 283.479 1.500 1.90366 31.3
2 69.112 7.814 1.49700 81.6
3 -189.067 0.200
4 61.932 5.665 1.74330 49.2
5 373.599 is variable
6ASP 46.853 0.200 1.51460 50.0
7 42.625 1.200 1.83400 37.3
8 11.814 4.459
9 -31.279 0.800 1.80420 46.5
10 51.165 0.200
11 31.113 3.090 1.92286 20.9
12-40.393 is variable
13 -14.484 1.000 1.80420 46.5
14ASP-32.781 is variable
15 aperture ∞ are variable
16ASP 29.904 2.600 1.69680 55.5
17ASP-81.848 is variable
18 16.786 6.333 1.49700 81.6
19 -19.337 3.165 1.80610 33.3
20 -37.633 0.200
21 19.209 1.000 1.90366 31.3
22 8.369 3.400 1.48749 70.4
23 26.440 1.000
24ASP 40.975 4.645 1.68893 31.1
25 -9.722 0.800 1.83481 42.7
26 16.614 1.000
27 19.708 4.000 1.60342 38.0
28 -38.921 2.733 31.3
29 -12.198 1.000 1.90366 31.3
30 -45.057 0.200
31 60.7116 4.013 1.63980 34.6
32-20.656 is variable
33 ∞ 2.000 1.51680 64.2
34 ∞
Aspherical surface data
The 06th K=0.00000E+00A4=1.03834E-05A6=8.50924E-08A8=-7.86199E-10 A10=4.00980E-12
The 14th K=0.00000E+00A4=-1.47857E-05A6=7.34210E-08A8=-2.02372E-0 9A10=1.61057E-11
The 16th K=-2.04200E+01A4=8.69120E-05A6=-4.40699E-07A8=-1.10867E-10A10=2.11281E-11
The 17th K=0.00000E+00A4=1.15580E-05A6=3.03675E-07A8=-5.37093E-09 A10=3.83096E-11
The 24th K=0.00000E+00A4=4.86302E-05A6=9.53000E-08A8=5.50455E-09A 10=2.51239E-11
VC looks in the distance in the middle of the wide-angle
Focal length 18.50 60.00 200.01 200.02
F value 3.500 5.801 6.301 6.316
Visual angle 39.16 13.10 3.94 4.35
D5 0.800 23.133 61.384 61.384
D12 3.340 2.860 2.711 2.711
D14 16.725 4.585 1.200 1.200
D15 4.188 5.340 1.900 1.900
D17 4.210 3.058 6.498 6.498
D32 12.500 43.490 47.023 47.023
Lens total length 106.986 147.691 185.944 185.944
The value of the conditional of the zoom lens of the 1st embodiment and the 2nd embodiment is as follows.
The 1st embodiment the 2nd embodiment
Conditional (1) F2/F3 1.087 0.918
Conditional (2) F1/FT 0.479 0.491
Conditional (3) β 3 0.073 0.146
Conditional (4) FVC/FM-0.215-0.210
Claims (10)
1. a Zoom lens system is characterized in that, comprises successively from object side:
The 1st lens combination (G1) with positive light coke;
The 2nd lens combination (G2) with negative power;
The 3rd lens combination (G3) with negative power;
And follow-up lens combination,
This Zoom lens system has aperture,
By making above-mentioned the 3rd lens combination (G3) and focusing near moving before and after at least 1 lens combination of image planes side is on optical axis than above-mentioned the 3rd lens combination (G3).
2. Zoom lens system according to claim 1 is characterized in that,
This Zoom lens system satisfies following condition:
(1)0.6＜F2/F3＜1.4
F2: the focal length of the 2nd lens combination
F3: the focal length of the 3rd lens combination.
3. Zoom lens system according to claim 1 is characterized in that,
This Zoom lens system satisfies following condition:
(2)0.18＜F1/FT＜2.10
F1: the focal length of the 1st lens combination
FT: the focal length of telescope end.
4. Zoom lens system according to claim 1 is characterized in that,
This Zoom lens system satisfies following condition:
(3)0.05＜β3＜0.20
The imaging multiplying power of the telescope end of 3: the 3 lens combination of β.
5. Zoom lens system according to claim 1 is characterized in that,
Above-mentioned the 3rd lens combination (G3) is made of single lens composition.
6. Zoom lens system according to claim 1 is characterized in that,
Above-mentioned follow-up lens combination has the 4th lens combination at least, and the 4th lens combination (G4) is made of single lens composition.
7. Zoom lens system according to claim 1 is characterized in that,
Above-mentioned follow-up lens combination has the 4th lens combination at least, when zoom, from the wide-angle side to the telescope end, above-mentioned the 1st lens combination (G1) and above-mentioned the 2nd lens combination (G2) move in the mode that it enlarges at interval, and above-mentioned the 3rd lens combination (G3) and above-mentioned the 4th lens combination (G4) move in the mode that it dwindles at interval.
8. Zoom lens system according to claim 7 is characterized in that,
The lens combination that constitutes the part of above-mentioned follow-up lens combination has the VC lens combination that moves along the direction vertical with optical axis when vibrationproof, this VC lens combination has negative power as a whole, and is made of positive and negative 2 lens at least, satisfies following condition:
(4)-1.0＜FVC/FM＜-0.1
FVC: the focal length of included vibration-proof lens group in the follow-up lens combination
FM: the focal length of follow-up lens combination.
9. Zoom lens system according to claim 1 is characterized in that,
Above-mentioned follow-up lens combination has the 4th lens combination at least, and said aperture (S) is configured between above-mentioned the 3rd lens combination (G3) and above-mentioned the 4th lens combination (G4).
10. Zoom lens system according to claim 9 is characterized in that,
Said aperture (S) when zoom and the part of above-mentioned follow-up lens combination or whole one move.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100480448A CN102073130B (en) | 2011-02-28 | 2011-02-28 | Zoom lens |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100480448A CN102073130B (en) | 2011-02-28 | 2011-02-28 | Zoom lens |
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| CN102073130A true CN102073130A (en) | 2011-05-25 |
| CN102073130B CN102073130B (en) | 2012-02-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011100480448A Expired - Fee Related CN102073130B (en) | 2011-02-28 | 2011-02-28 | Zoom lens |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2016139125A (en) * | 2015-01-21 | 2016-08-04 | パナソニックＩｐマネジメント株式会社 | Zoom lens system, interchangeable lens device, and camera system |
| JP2018084668A (en) * | 2016-11-24 | 2018-05-31 | キヤノン株式会社 | Zoom lens and image capturing device having the same |
| CN114895440A (en) * | 2022-04-29 | 2022-08-12 | 舜宇光学(中山)有限公司 | Optical imaging system |
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| JP2018084668A (en) * | 2016-11-24 | 2018-05-31 | キヤノン株式会社 | Zoom lens and image capturing device having the same |
| CN114895440A (en) * | 2022-04-29 | 2022-08-12 | 舜宇光学(中山)有限公司 | Optical imaging system |
| CN114895440B (en) * | 2022-04-29 | 2024-01-30 | 舜宇光学(中山)有限公司 | Optical imaging system |
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